Sony KV-28FQ75A Service Manual ▷ View online
5
21 pin connector
Connected
Not Connected (open) * at 20Hz - 20kHz
Pin No
1
2
4
Signal
Signal level
1
Audio output B
(right)
(right)
Standard level : 0.5V rms
Output impedence : Less than 1kohm*
Output impedence : Less than 1kohm*
2
Audio output B
(right)
(right)
Standard level : 0.5V rms
Output impedence : More than 10kohm*
Output impedence : More than 10kohm*
3
Audio output A
(left)
(left)
Standard level : 0.5V rms
Output impedence : Less than 1kohm*
Output impedence : Less than 1kohm*
4
Ground (audio)
5
Ground (blue)
6
Audio input A
(left)
(left)
Standard level : 0.5V rms
Output impedence : More than 10kohm*
Output impedence : More than 10kohm*
7
Blue input
0.7 +/- 3dB, 75 ohms positive
8
Function select
(AV control)
(AV control)
High state (9.5-12V) : Part mode
Low state (0-2V) : TV mode
Input impedence : More than 10K ohms
Input capacitance : Less than 2nF
Low state (0-2V) : TV mode
Input impedence : More than 10K ohms
Input capacitance : Less than 2nF
9
Ground (green)
10
Open
11
Green
Green signal : 0.7 +/- 3dB, 75 ohms,
positive
positive
12
Open
13
Ground (red)
14
Ground (blanking)
15
_
_
Red input
0.7 +/- 3dB, 75 ohms, positive
_
(S signal Chroma
input)
input)
0.3 +/- 3dB, 75 ohms, positive
16
Blanking input
(Ys signal)
(Ys signal)
High state (1-3V) Low state (0-0.4V)
Input impedence : 75 ohms
Input impedence : 75 ohms
17
Ground (video
output)
output)
18
Ground (video
input)
input)
19
Video output
1V +/- 3dB, 75ohms, positive sync 0.3V
(-3+10dB)
(-3+10dB)
20
_
_
Video input
1V +/- 3dB, 75ohms, positive sync 0.3V
(-3+10dB)
(-3+10dB)
_
Video input
Y (S signal)
Y (S signal)
1V +/- 3dB, 75ohms, positive sync 0.3V
(-3+10dB)
(-3+10dB)
21
Common ground
(plug, shield)
(plug, shield)
19
17
15
13
11
9
7
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20
18
16
14
12
10
8
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2
21
Rear Connection Panel
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6
AE-5A SELF DIAGNOSTIC SOFTWARE
The identification of errors within the AE-5A chassis is triggered in one of two ways :- 1: Busy or 2: Device failure to respond to IIC. In the event of
one of these situations arising the software will first try to release the bus if busy (Failure to do so will report with a continuous flashing LED) and
then communicate with each device in turn to establish if a device is faulty. If a device is found to be faulty the relevant device number will be
displayed through the LED (Series of flashes which must be counted) See table 1., non fatal errors are reported using this method.
one of these situations arising the software will first try to release the bus if busy (Failure to do so will report with a continuous flashing LED) and
then communicate with each device in turn to establish if a device is faulty. If a device is found to be faulty the relevant device number will be
displayed through the LED (Series of flashes which must be counted) See table 1., non fatal errors are reported using this method.
Flash Timing Example : e.g. error number 3
StBy LED
ON
ON
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OFF
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1
7
Device acknowledge is used to check IIC errors. Device acknowledge is checked by sending an IIC start sequence during CRT power on. Each
device is checked three times, if there is no acknowledge after each attempt, it will be regarded as an error.
There are three steps to check for errors.
device is checked three times, if there is no acknowledge after each attempt, it will be regarded as an error.
There are three steps to check for errors.
1.
IIC line 0
If all devices except the NVM have errors, IIC line 0 error is displayed.
If all devices except the NVM have errors, IIC line 0 error is displayed.
2.
Board check
If all devices mounted on one board have errors, board error is displayed.
If all devices mounted on one board have errors, board error is displayed.
3.
Each device check
If IIC line error and board error are not detected then the device with the error is displayed.
If IIC line error and board error are not detected then the device with the error is displayed.
The detected errors can be displayed as follows :
1.
Error Monitor Menu.
2.
Error Reader.
Error Detection Monitor
1. Error Monitor Menu
Operating Time :
000075
h
15
min
Stored Errors :
ERROR MONITOR
1.
D1 - B CXA1875 or MB88141
2.
No Error Occured
3.
No Error Occured
4.
No Error Occured
5.
No Error Occured
Current Error :
Start Error Sequence
1. IGNORE ERRORS OFF
ON
OFF
Last menu Enter Item
8
2. Error Reader Display
The error reader display is connected to the service connector to read actual error codes. The part number for the error reader display is
S-188-900-10. Once an error has been detected it will then be displayed on the two digit error reader. The errors displayed refer to the following
table.
S-188-900-10. Once an error has been detected it will then be displayed on the two digit error reader. The errors displayed refer to the following
table.
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